car-interface-android/lib/features/home/widgets/volume_card.dart

import 'dart:math' as math;

import 'package:flutter/material.dart';

import '../../../core/theme/app_colors.dart';
import '../../../core/widgets/app_icon.dart';
import '../../../core/widgets/pressable.dart';
import '../../../core/widgets/surface_card.dart';
import '../../../data/models/media_playback.dart';
import '../../../data/models/system_status.dart';
import 'marquee_text.dart';

/// The primary media control: a play/pause ring, a slider and step/mute
/// actions. The ring remains a volume gauge; its centre is the playback button.
class VolumeCard extends StatefulWidget {
  const VolumeCard({
    super.key,
    required this.volume,
    required this.onSetVolume,
    required this.onToggleMute,
    required this.isMusicPlaying,
    required this.onPlayPause,
    required this.media,
    this.compact = false,
    this.large = false,
    this.onPrevious,
    this.onNext,
    this.canPrevious = false,
    this.canNext = false,
    this.diagnostics,
    this.onToggleDiagnostics,
    this.unconfirmed = false,
  });

  final VolumeInfo volume;
  final ValueChanged<int> onSetVolume;
  final VoidCallback onToggleMute;
  final bool isMusicPlaying;
  final VoidCallback onPlayPause;
  final MediaPlayback media;
  final bool compact;
  final bool large;
  final VoidCallback? onPrevious;
  final VoidCallback? onNext;
  final bool canPrevious;
  final bool canNext;
  final String? diagnostics;
  final VoidCallback? onToggleDiagnostics;

  /// The car kept reporting a different level than the one written.
  final bool unconfirmed;

  @override
  State<VolumeCard> createState() => _VolumeCardState();
}

class _VolumeCardState extends State<VolumeCard> {
  double? _dragValue;

  int get _max => widget.volume.max <= 0 ? 15 : widget.volume.max;
  int get _value => widget.volume.index.clamp(0, _max);
  bool get _muted => _value == 0;
  bool get _fixed => !widget.volume.isControllable;
  int get _percent => ((_value / _max) * 100).round();

  String get _nowPlayingLabel {
    return widget.media.displayTitle ??
        (widget.isMusicPlaying ? 'Playing' : 'Nothing playing');
  }

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final theme = Theme.of(context);
    final compact = widget.compact;
    final displayValue = (_dragValue ?? _value.toDouble())
        .clamp(0, _max.toDouble())
        .toDouble();

    return SurfaceCard(
      padding: EdgeInsets.all(compact ? 20 : 26),
      radius: 30,
      child: Column(
        mainAxisSize: MainAxisSize.min,
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          Row(
            crossAxisAlignment: CrossAxisAlignment.center,
            children: [
              Row(
                mainAxisSize: MainAxisSize.min,
                children: [
                  if (widget.onPrevious != null) ...[
                    _SkipButton(
                      asset: 'assets/icons/skip-back.svg',
                      semanticLabel: 'Previous track',
                      onTap: widget.canPrevious ? widget.onPrevious : null,
                      compact: compact,
                      large: widget.large,
                    ),
                    SizedBox(width: compact ? 4 : 6),
                  ],
                  Pressable(
                    onTap: widget.onPlayPause,
                    semanticLabel: widget.isMusicPlaying
                        ? 'Pause music'
                        : 'Play music',
                    pressedScale: 0.94,
                    child: _VolumeRing(
                      progress: widget.media.progress,
                      isPlaying: widget.isMusicPlaying,
                      size: widget.large ? 124 : (compact ? 78 : 92),
                    ),
                  ),
                  if (widget.onNext != null) ...[
                    SizedBox(width: compact ? 4 : 6),
                    _SkipButton(
                      asset: 'assets/icons/skip-forward.svg',
                      semanticLabel: 'Next track',
                      onTap: widget.canNext ? widget.onNext : null,
                      compact: compact,
                      large: widget.large,
                    ),
                  ],
                ],
              ),
              SizedBox(width: compact ? 18 : 24),
              Expanded(
                child: Column(
                  mainAxisSize: MainAxisSize.min,
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    GestureDetector(
                      behavior: HitTestBehavior.opaque,
                      onLongPress: widget.onToggleDiagnostics,
                      child: Row(
                        children: [
                          Flexible(
                            child: Text(
                              'Media volume',
                              maxLines: 1,
                              overflow: TextOverflow.ellipsis,
                              style: theme.textTheme.labelLarge?.copyWith(
                                color: colors.inkMuted,
                                fontSize: compact ? 12 : 13,
                              ),
                            ),
                          ),
                          const SizedBox(width: 6),
                          Text(
                            '$_percent%${widget.unconfirmed ? '?' : ''}',
                            style: theme.textTheme.headlineMedium?.copyWith(
                              fontSize: compact ? 24 : 28,
                              fontFeatures: const [
                                FontFeature.tabularFigures(),
                              ],
                            ),
                          ),
                        ],
                      ),
                    ),
                    const SizedBox(height: 2),
                    SliderTheme(
                      data: SliderTheme.of(context).copyWith(
                        trackHeight: compact ? 5 : 6,
                        thumbShape: RoundSliderThumbShape(
                          enabledThumbRadius: compact ? 9 : 10,
                        ),
                      ),
                      child: Slider(
                        value: displayValue,
                        min: 0,
                        max: _max.toDouble(),
                        divisions: _max <= 30 ? _max : null,
                        onChanged: _fixed
                            ? null
                            : (next) {
                                setState(() => _dragValue = next);
                                widget.onSetVolume(next.round());
                              },
                        onChangeEnd: _fixed
                            ? null
                            : (_) => setState(() => _dragValue = null),
                        semanticFormatterCallback: (value) =>
                            '${(value / _max * 100).round()} percent',
                      ),
                    ),
                    SizedBox(height: compact ? 4 : 8),
                    if (_fixed)
                      Container(
                        height: compact ? 36 : 40,
                        alignment: Alignment.center,
                        decoration: BoxDecoration(
                          color: colors.surfaceStrong,
                          borderRadius: BorderRadius.circular(999),
                          border: Border.all(color: colors.border),
                        ),
                        child: Text(
                          'Volume is controlled by the car',
                          style: theme.textTheme.labelMedium?.copyWith(
                            color: colors.inkMuted,
                          ),
                        ),
                      )
                    else
                      Row(
                        children: [
                          _StepButton(
                            icon: Icons.remove_rounded,
                            semanticLabel: 'Volume down',
                            onTap: () => widget.onSetVolume(_value - 1),
                            compact: compact,
                          ),
                          SizedBox(width: compact ? 8 : 10),
                          Expanded(
                            child: Pressable(
                              onTap: widget.onToggleMute,
                              semanticLabel: _muted ? 'Unmute' : 'Mute',
                              pressedScale: 0.97,
                              child: Container(
                                height: compact ? 36 : 40,
                                decoration: BoxDecoration(
                                  color: _muted
                                      ? colors.accentSoft
                                      : colors.surfaceStrong,
                                  borderRadius: BorderRadius.circular(999),
                                  border: Border.all(
                                    color: _muted
                                        ? colors.accent.withValues(alpha: 0.25)
                                        : colors.border,
                                  ),
                                ),
                                child: FittedBox(
                                  fit: BoxFit.scaleDown,
                                  child: Row(
                                    mainAxisSize: MainAxisSize.min,
                                    mainAxisAlignment: MainAxisAlignment.center,
                                    children: [
                                      AppIcon(
                                        _muted
                                            ? 'assets/icons/volume-x.svg'
                                            : 'assets/icons/volume-2.svg',
                                        size: compact ? 16 : 18,
                                        color: _muted
                                            ? colors.accent
                                            : colors.inkMuted,
                                      ),
                                      const SizedBox(width: 8),
                                      Text(
                                        _muted ? 'Unmute' : 'Mute',
                                        style: theme.textTheme.labelMedium
                                            ?.copyWith(
                                              color: _muted
                                                  ? colors.accent
                                                  : colors.inkMuted,
                                            ),
                                      ),
                                    ],
                                  ),
                                ),
                              ),
                            ),
                          ),
                          SizedBox(width: compact ? 8 : 10),
                          _StepButton(
                            icon: Icons.add_rounded,
                            semanticLabel: 'Volume up',
                            onTap: () => widget.onSetVolume(_value + 1),
                            compact: compact,
                          ),
                        ],
                      ),
                    if (widget.diagnostics != null) ...[
                      const SizedBox(height: 8),
                      Container(
                        width: double.infinity,
                        padding: const EdgeInsets.all(8),
                        decoration: BoxDecoration(
                          color: colors.surfaceStrong,
                          borderRadius: BorderRadius.circular(10),
                          border: Border.all(color: colors.border),
                        ),
                        child: Text(
                          widget.diagnostics!,
                          style: theme.textTheme.bodySmall?.copyWith(
                            color: colors.inkMuted,
                            fontSize: 10,
                            height: 1.35,
                          ),
                        ),
                      ),
                    ],
                  ],
                ),
              ),
            ],
          ),
          SizedBox(height: compact ? 8 : 10),
          SizedBox(
            height: compact ? 18 : 20,
            child: Center(
              child: MarqueeText(
                text: _nowPlayingLabel,
                animate:
                    widget.isMusicPlaying && widget.media.displayTitle != null,
                style: theme.textTheme.bodySmall?.copyWith(
                  color: widget.media.displayTitle == null
                      ? colors.inkMuted
                      : colors.ink,
                  fontSize: compact ? 11 : 12,
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _SkipButton extends StatelessWidget {
  const _SkipButton({
    required this.asset,
    required this.semanticLabel,
    required this.onTap,
    required this.compact,
    required this.large,
  });

  final String asset;
  final String semanticLabel;
  final VoidCallback? onTap;
  final bool compact;
  final bool large;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    final size = large ? 46.0 : (compact ? 36.0 : 40.0);
    return Opacity(
      opacity: onTap == null ? 0.4 : 1,
      child: Pressable(
        onTap: onTap,
        semanticLabel: semanticLabel,
        pressedScale: 0.92,
        child: Container(
          width: size,
          height: size,
          decoration: BoxDecoration(
            color: colors.surfaceStrong,
            shape: BoxShape.circle,
            border: Border.all(color: colors.border),
          ),
          alignment: Alignment.center,
          child: AppIcon(asset, size: size * 0.45, color: colors.inkMuted),
        ),
      ),
    );
  }
}

class _StepButton extends StatelessWidget {
  const _StepButton({
    required this.icon,
    required this.semanticLabel,
    required this.onTap,
    required this.compact,
  });

  final IconData icon;
  final String semanticLabel;
  final VoidCallback onTap;
  final bool compact;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return Pressable(
      onTap: onTap,
      semanticLabel: semanticLabel,
      pressedScale: 0.92,
      child: Container(
        width: compact ? 36 : 40,
        height: compact ? 36 : 40,
        decoration: BoxDecoration(
          color: colors.surfaceStrong,
          shape: BoxShape.circle,
          border: Border.all(color: colors.border),
        ),
        child: Icon(icon, size: compact ? 18 : 20, color: colors.inkMuted),
      ),
    );
  }
}

class _VolumeRing extends StatelessWidget {
  const _VolumeRing({
    required this.progress,
    required this.isPlaying,
    required this.size,
  });

  final double progress;
  final bool isPlaying;
  final double size;

  @override
  Widget build(BuildContext context) {
    final colors = context.colors;
    return TweenAnimationBuilder<double>(
      tween: Tween(end: progress.clamp(0.0, 1.0)),
      duration: Duration(milliseconds: isPlaying ? 850 : 250),
      curve: Curves.easeOutCubic,
      builder: (context, value, _) {
        return SizedBox(
          width: size,
          height: size,
          child: Stack(
            alignment: Alignment.center,
            children: [
              CustomPaint(
                size: Size.square(size),
                painter: _RingPainter(
                  value: value,
                  trackColor: colors.border,
                  activeColor: colors.accent,
                ),
              ),
              Container(
                width: size * 0.62,
                height: size * 0.62,
                decoration: BoxDecoration(
                  color: colors.accentSoft,
                  shape: BoxShape.circle,
                ),
                alignment: Alignment.center,
                child: Icon(
                  isPlaying ? Icons.pause_rounded : Icons.play_arrow_rounded,
                  size: size * 0.34,
                  color: colors.accent,
                ),
              ),
            ],
          ),
        );
      },
    );
  }
}

class _RingPainter extends CustomPainter {
  _RingPainter({
    required this.value,
    required this.trackColor,
    required this.activeColor,
  });

  final double value;
  final Color trackColor;
  final Color activeColor;

  @override
  void paint(Canvas canvas, Size size) {
    final stroke = size.width * 0.055;
    final rect = Offset.zero & size;
    final center = rect.center;
    final radius = (size.width - stroke) / 2;
    final track = Paint()
      ..color = trackColor
      ..style = PaintingStyle.stroke
      ..strokeWidth = stroke
      ..strokeCap = StrokeCap.round;
    final active = Paint()
      ..color = activeColor
      ..style = PaintingStyle.stroke
      ..strokeWidth = stroke
      ..strokeCap = StrokeCap.round;

    canvas.drawCircle(center, radius, track);
    if (value <= 0) return;
    canvas.drawArc(
      Rect.fromCircle(center: center, radius: radius),
      -math.pi / 2,
      2 * math.pi * value,
      false,
      active,
    );
  }

  @override
  bool shouldRepaint(covariant _RingPainter oldDelegate) {
    return oldDelegate.value != value ||
        oldDelegate.trackColor != trackColor ||
        oldDelegate.activeColor != activeColor;
  }
}